锦屏二级水电站高埋深隧洞地下水处理技术

Groundwater treatment technology for deep buried tunnelsat Jinping Ⅱ Hydropower Station

摘要:

锦屏二级水电站深埋长隧洞群平均埋深达到1500～2000 m，地应力高，工程地质条件复杂，此地质条件下地下水处理施工较为困难。为解决以上问题，本工程地下水处理采取分阶段进行，即先对出水洞段进行勘察，然后表面封堵小流量及次大流量的出水点、段，再深层加固围岩，形成一定厚度的均一防渗固结圈，最后对集中涌水点进行封堵。处理后各项检查结果均满足合格标准，达到了预期的处理效果。

Abstract:

The deep-buried long tunnel group at Jinping Ⅱ Hydropower Station has an average buried depth of 1500～2000m with high stress and complex engineering geological conditions which lead to difficult groundwater treatment. Groundwater treatment for this project was done in stages. First, survey was performed for the outlet tunnel section; then, the outlet points and sections with small flow and sub-large flow were blocked on the surface, and the deep surrounding rock was reinforced to form a uniform anti-seepage consolidated ring of some thickness; finally, the concentrated water gushing point was sealed off. After treatment, the inspection results all met the standard and achieved the expected treatment effect.